Question

Which is least thermally stable?

• A. $Li_2CO_3$
• B. $MgCO_3$
• C. $BaCO_3$
• D. $BeCO_3$

Answer 1

Answer: (D)

$BeCO_3$

Answer 2

$BeCO _{3}$ is least thermally stable. The thermal stability of carbonates increases down the group i.e from Be to $Ba$.

$\underset{(523 K)}{BeCO_3}